The phrasal verb "yammer on" is predominantly used in informal contexts. It typically describes someone talking continuously and often annoyingly about something unimportant or in a complaining manner. Commonly, it may be used negatively or humorously to emphasize someone's excessive or monotonous talking. You might hear it in casual conversations among friends or in comedic contexts and dialogue in media. Rarely would you encounter "yammer on" in formal writing or speech, as it carries a colloquial and slightly pejorative connotation, like saying someone is blabbering or rattling on. Its usage often implies a lack of engagement or a desire for the speaker to stop talking so much.
B2
UpperIntermediate
1. To talk persistently and often annoyingly, usually about trivial matters.
He yammered on for hours about his personal problems.
During the meeting, the manager yammered on about topics unrelated to the agenda.
She tends to yammer on about her favorite TV shows, even if no one is interested.
Whenever he's nervous, he starts to yammer on without stopping.
The presenter yammered on and failed to engage the audience.